Dover HEIL LIBERTY TP1L-SM-0520, Service Manual

Page: 61 / 136

Issued May 2020
Lift Arm
Copyright 2020, Heil Environmental
Printed in the U.S.A.
Lift Arm
55
LIFT CONTROL VALVE PRESSURE ADJUSTMENTS
The lift control valve has adjustable hydraulic pressure settings that should be checked twice yearly (1000 hrs). All lift valve
pressure adjustments are made with the engine running at idle. In general, hydraulic pressures are normally increased by
turning the pressure adjusting screw clockwise. Follow the steps below to adjust the pressures on the Python lift arm.
Watch the Preventive Arm Lift Maintenance video on the Heil Service Shack (https://www.heil.com/heil-service-
shack) .
Quantity Tool
1 Personal protective equipment
1 Pressure gauge (0-5000)
1 1-1/2" Wrench
1 15/16" Wrench
1 7/16" Wrench
1 1/8" Wrench
1 1/2" Hex Wrench
1 Wire cutters
1 Slotted Screwdriver
WARNING
Moving equipment can be dangerous to bystanders. Serious injury or death can occur if a person is in the wrong area or is
not attentive to the operations. Clear the area of all unnecessary people before you operate the controls.
WARNING
The hydraulic fluid may be under pressure and may spray while you open the connection. Hydraulic fluid may cause
damage to your eyes, hands or skin. Wear protective eye glasses, gloves and other clothing as necessary to protect you
from the hydraulic fluid.
NOTICE
This procedure requires two properly trained technicians.
Before checking or adjusting the pressure settings, you will need to find a properly trained technician to help. When you are
able to recruit some help, create hand signals to use while working together. Nonverbal communication will be key to
keeping yourself and any bystanders safe while working with the Python lift arm.
The trained technician will operate the controls form inside the cab, while you will be working on the pressure settings from
the street side.
To start checking the Lift Arm Valve Pressures, you will need to put the lift arm in Manual Mode.
A. To Place the Lift Arm In Manual Mode
1. Make sure the key switch is on.
2. The system power is on.
3. Then hold the grabber open and grabber close buttons at the same time, until the alarm stops sounding.